Pts for trials 6 10 what is in the blank list the

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Chemistry & Chemical Reactivity
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Chapter 22 / Exercise 52
Chemistry & Chemical Reactivity
Kotz/Treichel
Expert Verified
7. (0.5 pts) For trials 610, what is in the blank? List the chemical(s) and their concentration(s).
8. (0.5 pts) What is the purpose of trials 710? Pick the best answer:
9. (1 pt) Why do you use the same wavelength in trials 710 as you used in trials 25rather than redo thespectrum to determine a new wavelength?
Question 10 out of 1 pointsIf the absorbance of a 2.47 x 10-4M solution is 0.687 and you measure an absorbance of 0.323 for a second solution of the same species at the samewavelength using a cuvette with the same pathlength, what is the concentration of that second solution?Selected Answer:[None Given]
Question 20 out of 1 points
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Chemistry & Chemical Reactivity
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Chapter 22 / Exercise 52
Chemistry & Chemical Reactivity
Kotz/Treichel
Expert Verified
Look at trial 8. Please determine the initial concentration of Fe3+in the reaction vessel just when the reaction begins.Selected Answer:[None Given]Answers:0.2M0.1M0.02M0.01MResponse Feedback:The initial concentration of Fe3+is always diluted by a factorof 2, from 5ml to 10ml. Correct sig figs depend on the sig figs inthe data.
Question 30 out of 1 pointsLook at trial 8. Please determine the initial concentration of SCN-in the reaction vessel just when the reaction begins.Selected Answer:[None Given]
M
Question 40 out of 1 pointsFor trial 8, a student determined that the equilibrium concentration of [FeSCN]2+was 6.0 x 10-5M. Determine the equilibrium constant for this run.(Hint: look in the lab instructions for how to do this.)Selected Answer:[None Given]Answers:6.0

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